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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e6b5d958c07a1e325ddb2f631bf431c54bffc269dbc80f09eddafaaa63a613' 
  AND token = 'NLjVkDs693t1wkvz8LGlBf2+3UDrx9CbqZBjio3tMQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}